Remove WebURLResponse::ExtraData

This is only used for effective_connection_type now, which
can easily move to InternalDocumentStateData.

Bug: 855189
Change-Id: Ic4ddd5268fa701513dee8a0759a153a35244294e
Reviewed-on: https://chromium-review.googlesource.com/c/1369942
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#616927}
11 files changed